Notice
Notification, Flier
noun, する verb
This is a strange word, so you'll have to bear with me. You know that 知 means know. But in the case of this word, what do you know? Look at the second half. らせ sounds a bit like "race." So, you know about a "race." How do you know about this race? You got a notice or notification about it.
おしらせ
Remember 知る? This is the same reading (し). So, if you know that, you'll be able to read this one as well.
あのう、お知らせしたいことがあるんですが、今、いいですか？
Excuse me, I have something that I’d like to tell you - do you have some time now?
学校からのお知らせはもうよみましたか？
Did you read the notice from the school already?
残念なお知らせがあります。昨夜誰かがこの家に侵入し、冷凍庫に入っていたアイスクリームを全部盗んでしまいました。
I have some bad news. Someone broke into our home last night and stole all the ice cream we had stored in our freezer.